Screw gauge



gum 26, wm., Hm

W. SCHAURTE SCREW GAUGE Filed Feb. 12, 1927 20 more or less rough Patented de 2 i928.

This invention has reference to screw gauges generally, and it relates more particu arly to limit gauges for interior screw threads and it is one of the important ob- 5Y jects of the invention to provide means for ascertaining whether or not the admissible limit or margin of deviations has been adhered to or not, or whether such limit has been exceeded or whether the thread remains too much below such limit, so that the gauge -according to this invention will -serve as a means for asserting the screws and determining -whether they are in condition to be .passed or lrejected as waste. Among `other 15 important objects and advantages the device according to the invention is distinguished from the previous state of the art by its simple and stable construction, so that the device is particularly well adaptedl for the handling in the workshop, and itis a further, object of the subject matter of the invention to accelerate and facilitate the process of examination.

v The essential feature ofthe invention re- 85 sides in the arrangement of two eccentricall disposed discs or disc sections to be rotata ly-displaced with relation to eachother, and which are disposed at right angles to their axis of rotation and provided with marginal thread engagsging| portions `which A are arrangedin parallel relation tothe pitch angle of the threads to be examined.

marginal disc portions are Iadapted to become engaged into or around the threads when the disks are relatively turned or rotated, while the amount of'relative turning is ,indicated upon a graduated scale by a vpointer or the like, from which the operator will Abe able to ascertain whether or not the 40 admissible limit or margin of variations upwards or downwards has been adhered to.

The invention will be more fully and pary ticularly describedby reference to the accompanying drawing, showing by way of exea-emplication-'in Figure 1.a sectional view "through a nut with the testing or gauging -device for the good condition of the article with `two adjacently vdisposed disc sections the vmarginal portions of which, as above s scnaun'rn, or Nnuss, annum.

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Application le February 12, 19a?, Serial No. 167,843, and in Germany February 1%, 19M.

outlined, are constructed -in such a manner, as to be in accordance with the requirements v for good-condition-gauges for threads, inasmuch as they will simultaneously gauge the pitch 'and the diameter of the iianks so as to make sure that the auged nut may be screw liladedly mounted upon a corresponding Figure 2 of the drawing is a side view or plan view corresponding to Figure 1. Figures 3 to 7 are respectivel sectional views 00 and side elevations of em odiments of the principle of the invention, as applied to the examination of articles having defective threads. In Figure 8 another modification is shown, representing the combination of a 66 gauge for the examination of the good-conition articlesand articles having defective threads.

`Upon a sleeve 1 (Figure 1) with handle 2 and graduated disc 3 attached thereto a disc 7o 4 is ececntrically mounted, while a second disc section 5 is keyed to a bolt or rod 6 Y guided in the sleeveand provided with -a ointer 7, the section 5 being likewise eccentrically disposed on the bolt. The

edges of the disc sections car projections 8 adapted to become engage between or around the screw threads of the threaded nut 9, and shaped in such'a manner that they will test and gauge the pitch 'and the 80 ankfdiameters. lThe amount of turning of .the disc sections required until enga ement is effected is indicated by the pointer upon the graduated disc 3. The said scale of di.-

visions (Figure 2) Vhas graduations for the 85 i exact theoretical measuring of the thread and for the still admissible deviations u wards and downwards for practical wor the so-called limit of allowable variations, and, if desired with subdivisions. 90. In Figures 3 and 4i a gauge is shown for testing threads found not absolutely perfect 'for the purpose of determining whether or not the deviations are within allowable limits. In this construction the disc sections are replaced by solid eccentrically disposed discs 10 andll. The outer edges of the. discs are bevelled olf on both sides in accordance with the shape of the threads, by which means it becomes possible to makethe two discs so narrow. that they are adapted to become engaged at two oppositely disposed points of the thread differing for the value of half a pitch, the discs becoming thereby housed between the flanks of the thread. The indicating means are the same as described with reference to Figures d and 2.

lin the modiied construction according vto Figures 5 and 6 the disc 10 is refplaced by-a disc section 12 constituting a ork which, While being rigidly secured to the lsleeve l, is, on the other hand, rotatably mounted on the holt or rod 6 by means of a. hub portion 13. Instead of the disc 11 a disc section 4 v is keyed or otherwise rigidly secured to t e rod 6 and may be rocked within the forked disc 12 by the rotation of the rod or bolt'ti. l'llhe edge 15 of the forked disc 12 'is likewise fork-shaped, so that it will not become situ .fated between the flanks of the tliread,`but

vis adapted to embracetwo adjacent flanks. The interior surfaces of the marginal forked portion are'bevelled od' to correspond with the Hank faces.

In the modificationaccording to Figure 7 the two disc sections have a round edge, in which ease the marginal disc portion must be of greater thickness, and thediscs are staggered at their hub-contacting surfaces so that the distance between their contacting suifaces, as measured by vthe distance between parallel transverse lines intersecting said surfaces, will not exceed one half of the height of a convolution .of a thread.

In the modification according to Figure 8 a double gauge is shown, in which a gauge according to Figures 1 and 2 isl combined with a gauge according to Figure 5. The nut 9 has been passed along the first-named gauge, and is now disposed on thev secondnamed gauge. The forked disc 12 with its two hub portions is rigidly secured to the sleeve 1. The gauge 4, 5 ma here be need to indicate whether or not t e threads are perfect and if they are found imperfect the gauge 12, 14 may then be used to determine whether or not the imperfections are within permissible limits .or the article should be rejected.

The various forms of embodiments of the principle of the invention herein shown and described should be understood Aas being merely illustrative exemplications thereof, without limiting the invention to any par-y ticular form and -arran ement of parts, but it should be understood that the invention may find expression in other embodiments and in other modifications, except as otherwise appears from the appended claims.

ll claim 1. In a device of the kind described, con- Leraars centricallydisposed relatively rotatable rod and sleeve members, thread `feeling and engaginggmembers veccentrically mounted on said rod and sleeve members respectively, and means on said rod and sleeve members for indicating the relative angular rotation of said thread feeling and engaging mem- 2. linfa device of the lcind described, conccntrically disposed relatively rotatable rod and sleeve members. there being enacting graduations -and indicating means at one end of-said ,rod and -'sleeve membersrespectively, two adjacently disposed arms, ixedly mounted respectively at the other ends of the said rod and sleeve members, and screwthread engaging and feeling means of a predetermined thread proile at the ends of said arms.

3. ll'n a device ofthe. kind described, concentrically disposedrelatively rotatable rod and sleeve members.. there being coacting graduations and indicating means at one end of said members restiectively, two adjacently disposed arms, 'xeilly mounted respectively upon they other eiids-` of the respective rod and sleeve members,-and fork-shaped portions on said armszaljdapted for the engage-v ment and for the'. embracing of screw threads. f"

4. ln a device oflthe kind described, con i centrieally disposed relatively rotatable rod and sleeve members. there being eoacting graduations and v indicating means respectively disposed at one end ofl said rod and sleeve members. two adiacently disposed arms, hub portions on said arms, staggeringly and mounted respectively upon the other ends` of the rod andv sleeve members, and marginal guide portions on said arms adapted for engagement with andthe'gauging of 'screw threads. Y

5.r ln a device of the kind described, concentrically disposed rod and sleeve inembers rotatable Vwith relation to each other, there being coact-ing indicating means respectively disposed at one end of said rod 'at right angles thereto. and thread engaging and Y gauging means of va predetermined thread profile at the free ends of said armso i las 7. In a device of the kind described, conof the rod and sleeve members, and broad centrioally disposed rod and sleeve members ened, serrated, screw-thread engaging exturnable with relation to each other, there tensions at the outer'ends of said arms for 10 being coacting indicating means respecthe gauging of the exaotness of said screw- 5 tively disposed at one'end of said rod and threads.

sieeve members, two adjacently disposed Intestimony whereofl aix 1n arms respectivelymounted at the other ends WERNER S "I 

